User blog comment:Dante-Must-Die-Mode/What The Heaven And Hell?: Nero/@comment-967403-20150329222022/@comment-967403-20150330070710

Both Baul and Modeus's swords resemble Rebellioin and seem inspired by it since their master was Sparda. That was 2000 years ago too. Yamato is the same case since we know it was made to seal the hellgates. Safe to say Rebellion and Yamato were made around the same time. Nothing exact. They're old blades. Older then Dante,Vergil, and Nero.

While the Devil Arm usage to substain their Devil Trigger, DMC1 and 3 explicitly state (one of them at least) that Rebellion also is the physical manifestation of his (Dante) strength. They're magic blades created presumbably by Sparda. When it comes to the family using it, it's not just beause they happen to have power. It's "natural" so to speak that the Devil Arms augments them. Part of the reason why they're momentos.

The strategy guide for DMC4 also covers the reason why Nero neeeded Yamato. Apparently, the blade releases the latent power inside Nero. He does actualy have a unique connection to it. Rebellion releases the latent power in Dante by giving him DT just like Yamato did to Nero by giving him DT. Both blades have a connection to it not many others can have. While character can use the weapons, some cannot use it to the fullest of capabilities like the family can. In the case of Yamato and Rebellion. No one has ever used Yamato like Vergil/Nero/Dante.

Part of that reason is because they're family, the swords does have a unique connection to them. Both Rebellion and Yamato show this with Dante and Nero and that's actually stated AND shown (DMC3 with Dante being stabbed and the sword getting his blood and awakening. DMC4 with Nero literally fixing the sword. There's a reason why Agnus was pissed. It's not something anyone can do.) It's not just some thing were it just happens cause they wanted to live. The swords do have a actual connection. And it's outright stated even. And shown. From what you said, anyone can fix Yamato If they wanted the will to live and needed to resonate with some power.

Sanctus was not able to completely resonate with the Sword of Sparda either. Nero completely surmised that the reason was because he lacked heart. Arkham tried too and turned into a blob. They can only get so much of it but not it's full extent, much of their frustration.

It's a fact that the sword Yamato and Rebellion can forge a unique connection with some of the family, despite it being made before they were born (Again. They're magic swords. The connection has bit more to do with the status of them being related to Sparda. It's not a coincidence only the family can master it fully). It's stated and shown. What I'm saying is that Vergil probably does. It's not outright stated in his case but If it was needed to release his own DT (just like Nero and Dante), there's probably a unique connection too.